一、mysql的多实例

NGINX多实例就是多个配置文件
mysql多实例：同一个软件启动多次，就是多个进程，每个进程监听的端口不同
    1.不同的数据目录
    2.不同的端口
    3.不同的socket文件
    4.不同的日志文件

1.创建多个数据目录

[root@db01 ~]# mkdir /data/{3307,3308,3309} -p

2.准备多个配置文件

[root@db01 data]# vim /data/3307/my.cnf
[mysqld]
basedir=/service/mysql
datadir=/data/3307/data
port=3307
socket=/data/3307/mysql.sock
log-error=/data/3307/data/mysql.err
log-bin=/data/3307/data/mysql-bin
server_id=7

-------------------------------------------

[root@db01 data]# vim /data/3308/my.cnf
[mysqld]
basedir=/service/mysql
datadir=/data/3308/data
port=3308
socket=/data/3308/mysql.sock
log-error=/data/3308/data/mysql.err
log-bin=/data/3308/data/mysql-bin
server_id=8

--------------------------------------------

[root@db01 data]# vim /data/3309/my.cnf 
[mysqld]
basedir=/service/mysql
datadir=/data/3309/data
port=3309
socket=/data/3309/mysql.sock
log-error=/data/3309/data/mysql.err
log-bin=/data/3309/data/mysql-bin
server_id=9

3.初始化多套数据目录

[root@db01 scripts]# ./mysql_install_db --defaults-file=/data/3307/my.cnf --user=mysql --basedir=/service/mysql --datadir=/data/3307/data

[root@db01 scripts]# ./mysql_install_db --defaults-file=/data/3308/my.cnf --user=mysql --basedir=/service/mysql --datadir=/data/3308/data

[root@db01 scripts]# ./mysql_install_db --defaults-file=/data/3309/my.cnf --user=mysql --basedir=/service/mysql --datadir=/data/3309/data

#使用tree可以查看
[root@db01 scripts]# tree -L 3 /data

4.授权目录

[root@db01 scripts]# chown -R mysql.mysql /data

5.启动数据库

[root@db01 scripts]# mysqld_safe --defaults-file=/data/3307/my.cnf &
[root@db01 scripts]# mysqld_safe --defaults-file=/data/3308/my.cnf &
[root@db01 scripts]# mysqld_safe --defaults-file=/data/3309/my.cnf &

6.检查启动

[root@db01 scripts]# netstat -lntup|grep 330
tcp6       0      0 :::3307                 :::*                    LISTEN      25550/mysqld        
tcp6       0      0 :::3308                 :::*                    LISTEN      25722/mysqld        
tcp6       0      0 :::3309                 :::*                    LISTEN      25894/mysqld     

7.多实例设置密码

[root@db01 scripts]# mysqladmin -uroot -S /data/3307/mysql.sock password '3307'
[root@db01 scripts]# mysqladmin -uroot -S /data/3308/mysql.sock password '3308'
[root@db01 scripts]# mysqladmin -uroot -S /data/3309/mysql.sock password '3309'

8.多实例验证

[root@db01 scripts]# mysql -uroot -p3307 -S /data/3307/mysql.sock -e "show variables like 'server_id';"
Warning: Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id     | 7     |
+---------------+-------+

[root@db01 scripts]# mysql -uroot -p3308 -S /data/3308/mysql.sock -e "show variables like 'server_id';"
Warning: Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id     | 8     |
+---------------+-------+

[root@db01 scripts]# mysql -uroot -p3309 -S /data/3309/mysql.sock -e "show variables like 'server_id';"
Warning: Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id     | 9     |
+---------------+-------+

9.连接多实例小技巧

[root@db01 scripts]# vim /usr/bin/mysql3309
mysql -uroot -p3309 -S /data/3309/mysql.sock
[root@db01 scripts]# vim /usr/bin/mysql3308
mysql -uroot -p3308 -S /data/3308/mysql.sock
[root@db01 scripts]# vim /usr/bin/mysql3307
mysql -uroot -p3307 -S /data/3307/mysql.sock

[root@db01 scripts]# chmod +x /usr/bin/mysql*